A town N is 340km due west of
town G and town K is due west
of town N. A helicopter Zebra
left G for K at 9a.m. Another
helicopter Buffalo left N for K
at 11a.m. Helicopter Buffalo
travelled at an average speed of
20km/h faster than helicopter
Zebra. If both helicopters reached
K at 12.30p.m, find the speed of
helicopter Buffalo.
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